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On 29th July 2008, The KDE Community released KDE 4.1.0. This release is the second feature release of the KDE 4 series, sporting new applications and newly developed features on top of the Pillars of KDE4. KDE 4.1 is the first KDE4 release to contain the Personal Information Management suite KDE-PIM with its E-Mail client KMail, the planner KOrganizer, Akregator, the RSS feed reader, KNode, the newsgroup reader and many more components integrated into the Kontact shell. Furthermore, the new desktop shell Plasma, introduced in KDE 4.0, has matured to the point where it can replace the KDE 3 shell for most casual users. Like with our previous release much time has been devoted to improving the framework and underlying libraries on which KDE is built. .If you want to know more features in KDE 4.1 check here

KDE 4.1 Highlights

Greatly expanded desktop shell functionality and configurability

KDE Personal Information Management suite ported to KDE 4

Many new and newly ported applications

Install KDE 4.1 in Ubuntu/Kubuntu hardy

You need to edit the /etc/apt/sources.list file

sudo gedit /etc/apt/sources.list

For Kubuntu Users use the following command

sudo kate /etc/apt/sources.list

add the following line

deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu hardy main

save and exit the file

Update the source list using the following command

sudo apt-get update

For Ubuntu 8.04 users use the following command to install

sudo apt-get install kubuntu-kde4-desktop

For Kubuntu 8.04 users use the following command to install

sudo apt-get dist-upgrade

Note you may need to install kdebase-runtime-data-common in order to get Application directory icons under the Kickoff menu.

When I boot into ubuntu, it comes up with kubuntu on load, sign in kubuntu style, then when I get in to ubuntu and I go to System (drop down) it says About GNOME in the menu not KDE. I presume I have gone wrong somewhere?

I needed to used both “kubuntu-kde4-desktop” and “dist-upgrade”, but after that got it running like a charm.
I had just upgraded Kubuntu 7.10 (actually Estobuntu which is based on Kubuntu 7.10 + Estonian addons) to 8.04 Hardy repos. Installing KDE 4.1 was really easy using the instructions above.
Thanks Ubuntu Geek!

When I finished the install, I assumed it would be like I expected, that is, Kubuntu with KDE 4.1. Though it seemed to go through the process of installing, it never changed from being a 3.5.9 KDE. There were 4.1 packages in the menus (along side the older versions), but the desktop didn’t change. Obviously newbie problems here. But it would be nice to have it be a little more intuitive. Or maybe it will work if I start with Ubuntu rather than Kubuntu. In case I can get some helpful hints, I am keeping the iso handy. What I am looking for is Kubuntu running 4.1 KDE and 3.5… no longer evident. Thanks.

i have installed kde 4.1 but when i boot into it i get nothing but a white screen eveything seems to be working fine becoz i can open the task manager and see that everything is runnin fine yet i can not do anything coz there is nothin other then a white screen

Mark,
I’m just guessing, but you may need to choose “KDE 4.1 session” when you login. On the login screen (when you boot up the computer), look for a dropdown box that says “Session type” or something like that (I forget the exact terms used).

Got it working just fine. However, I have reverted back to kde3.5. There are too many things yet missing in kde4 for now: no panel hiding is the biggy for me, but also all panel configuration in general, administrator mode for login manager, etc. , etc., I don’t understand why kde4 was released with this much missing !

After following this titorial, for some reason I still only have KDE (3) as a session choice at login, even though repeating the “sudo apt-get dist-upgrade” command confirms 0 to install and 0 to upgrade.
I added the repository to the sources list, I even installed the KDE 4 PIM packages. What could I be doing wrong?